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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a9ae767a4255df62bb40eae63a790ecc93af2ee1ce1ed4b099e8d7c2562895' 
  AND token = '/VDFHLH37sKNfxWATeV/6zh1s7mHHuVC5tZb/Q3fSMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}